Apparatus for welding by electricity.



W. 1). BARTLETT. APPARATUS FOR WELDING BY ELECTRICITY. APPLICATION: FILED APR.24,1911.

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W. D. BARTLETT. APPARATUS FOR WELDING BY ELECTRICITY.

APPLICATION FILED APR.24,1911. I Patented Dec. 31, 1912.

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UNITED srrarn s PATENT oFFIoE.

-WILLIAM D. BARTLETT, OF. CLEVELAND, OHIO, ASSIGNOR TO THE ELECTRIC WELDING PRODUCTS COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO. I

APPARATUS FOR WELDING ELECTRICITY. V

Specification of Iietters Patent.

Patented Dec. 31,1912.

Application filed A rnai, 1911. Serial 110.162.2983;

To all whom it may concern:

Be it known that I, VILLIAM D. BART- LE'lT, a citizen of the United States, resident of Cleveland, county of Cuyahoga, and State of Ohio, have invented a new and useful Improvement in Apparatus for lVelding by Electricity, of which the following is a specification, the principle of the invention being herein explained and the best mode in which I have contemplated applying that principle, so as to distinguish it from other inventions.

My present invention relates to apparatus for welding by electricity, such my invention shown, described and claimed in Patent No. 915,249, issued March 16, 1909, and has for it object the provision of means whereby such welding process may be carried out in an economical and efficient manner.

The said invention consists of means which are hereinafter fully described and particularly set forth in the claims.

The annexed drawings and the following description set forth in detail certain means embodying my invention, the disclosed means, however, constituting but one of various mechanical forms in which the principle of the invention may be employed.

In said annexed drawings :Figure l is a front elevation of a machine embodying my invention. Fig. 2 is a vertical cross section taken upon the plane indicated by line TI-II in Fig. 1. Figs. 3 and t are detail sections taken upon the planes indicated respectively by lines IIIHI and lV-IV in Fig. 2. Fig. 5 is a detail section upon an enlargcd scale, taken upon the plane indicated by line V-V in Fig. 2. Fig. 6 is a perspective view on an enlarged scale of a detail part of the machine. Fig. 7 is a plan of the main frame of the machine, with parts of the welding-heads removed, and disclos ing the main frame members of such heads. Fig. 8 is a cross-sectional view taken upon the plane indicated by line VIII-V111 in Fig. 1.

The machine consists primarily of three main parts, namely the main frame A, the

movable welding-head B, and" the stationary welding-head C. These welding-heads are each connected with the .terminals (not shown) of the secondary coil of a transformer such as is usually used in this class of devices, and the structure and operation of which are well known to those skilled in the art. As in other machines of this class, the two elements which are to be welded together are clamped respectively in the welding-heads, whereupon the reciprocable memberv is moved toward the stationary member until contact and suflicient pressure are established, to enable a welding current passing across the gap to effect the required weld.

The machine. illustrated in the drawings is designed particularly for welding boltheads to bolt-shanks. The movable Weldinghead B-is arranged to receive and hold the bolt-head, and the stationaryweldinghead C is arranged to receive and hold the bolt-shank.

The welding-head B comprises in its structure a main frame member B, which is provided with slides Z) Z) mounted in grooves or slideways (a a formed in and running longitudinally of the main frame A, as shown in dotted lines in Figs. 1 and 7, and in cross-section in Fig. 2. These slideways are preferably formed. upon the interior of the main frame A, as shown, and the slides Z) are in-eferably cast integral with the main frame member B. Suitable means (not shown), are provided and connected with the member B for reciprocating the welding-head B in the slideway a. As is usual,

these reciprocating means are operated manually, as will. be readily understood.

The welding-head C is placed at a suitable pointon 'tlieframe A, as shown in Fig. 1, and is fixedly secured to such frame by means of bolts 0 c, shown in Fig. 8. As is shown, the slides Z) extend substantially the full length of the frame member B and beyond said frame member to the left so as to extend a considerable distance under the welding-head C, shown in dotted lines in Fig. 1, the slideways a a being made to ex tendsubstantially the entire length of the frame A- The left hand or free ends of these slides are connected with each other by means of a brace or cross-piece b, which is I able screws (2 'tom to reassume such straight line during its travel is reduced to' a minimum, of the two members to be welded thereby repeatedly obtained, after the. two heads have been properly alined to registration.

I will now describe the details. of the mechanism which have for their object such proper above-mentioned alinement of the welding-heads, that is, the proper alinement of the clamping jaws which hold the two members to be welded. intersecting the left hand end and upper surface of the frame member B on'the welding-head B, Figs. 1, 2 and 7, is a segmental cylindrical surface 6 whichifprms the journal bearing for a cylin- D. This bearing 5 has its axis parallel with the direction of travel of the welding-head l3, and when the sleeve D is seated therein the axis of the latter is also parallel with such direction of travel. This sleeve is provided with the interior cylindrical bearing surface d, whose axis, however, is eccentric with respect to but parallel with the axis of the sleeve D, and seated in this bearing surface is a cylindrical member D to which is secured, by means of removthe stationary clamping jaw D of the welding-head B. In the machine illustrated, this clamping jaw 'is provided with asemi-hexagonal seat d to'receive the hexagonal head of a bolt.

Fixedly secured to the frame member l3 is a secondary frame member B which forms a support for various parts of the head which will be hereinafter described.

The sleeve D is split, as shown at a fi' and' resting upon the top thereof is a clamping saddle E, as shown in Figs. 1, 2 and 4. This saddle is engaged by a thumb-screw E, which is threaded in the end of an extension 8 of the frame member B down this thumb-screw, the saddle is caused to clamp the sleeve D in its bearing b and also effect the contraction of this-sleeve so as to fixedlysecure the member Di therein. By loosening the clamping saddle E the sleeve D may be rotated and thereby raise or lower the axisof the cylindrical member D. When' such change of location brings the bottom of the'hexagonal seat at" hut of a horizontal plane, the member D may be rotated within the sleeve D, witho it rotating this sleeve, while the saddle i still in its loosened position, so as to cause/said bob horizontal position, as will be readily understood. It will therefore be seen that the clamping jaw- D may be raised or lowered so as to assume cs1- tions in different horizontal planes, an adjusted so as to have the bottom of seat d'in a horizontal position. It willibe noted,

and the desired registration effect such [in which is rotatably By screwlng 'carryingthje movable clamping jaw f.

lateral or transverse alinement, inasmuch as the rotation of the sleeve D causes such axis torotate about the sleeves axis and swing on a short arc. throws the clamping jaw D and seat all also out of such alinement. Unless means are provided for compensating for this lateral or transverse displacement, it will be seen that the proper alinement of the clamping jaws of the two welding-heads can not be" obtained, and to effect-this compensation the This movement therefore welding-head C is arranged in a manner which I shall now describe. This weldinghead 0 is provided, Fig. 8, with a main frame member C, on the uppersurfa ce-of which is formed a transverse guide O Slidably' mounted on the rear portion of this glide is the movable clamping bl0ck C", 1n ing jaw 0. which are front end of which is secured the clamp Suitable mechanism, the details of described in said above-named patm ent and do not form any part of this inven-,

tion, and which includes the manually operable arm C suitably pivoted on an upright portion 0 of the frame-member G, is provided for reciprocating the block C and said Mounted upon the front clamping jaw 0. portion of the guide C is the stationary clamping block C .in whose rear face is seated and secured the stationary clamping jaw C. frame member C Fig.

1,,which receives the guide C Secured to- This block is held securely to the by means of stud bolts .-0* .0 which pass through elongated slotsc formed in the block, and nuts 0 0. 'blockis also provided with a groove 0,

This I the frame member'G is a.bracket Fig; 8,; v,

mounted an adjusting I screw 0 whose rear end is threadedinto the block G as shown. This screw is mounted in said bracket in a manner such that itis secured against longitudinal displacement, as for instance, by I means of collars 0.

ids

After loosening up the nuts 0? 0*, it will i the screw a the position of the block 0 maybe horizontally varied, and the amount of this variation may be made to correspond with the amount of lateral displacement of the clamping aw,

seen that by turning D of the welding-head B. It will there orebe seen that, by means of the above-described may be given 1 the exact required height above the frame,'

means, the seat d of jaw D and then by adjusting block G, jaw G-may be horizontally shifted to receive the proper transverse alining position.

Pivotally mounted'uppn the frame WW? her B" of the welding head B is an tory armFg Fig. 2, it's'pivotal axis being at the rear thereof, and its front or free i rlxl e lower end 1" of this jaw is flat, and adapted to engage when lacedinthe stationary clamping aw- .D, eninsuchengagemept-with the up he upper face of the bolt-head per surface of the bolt-head, this lower end should be parallel with the bottom of seat (1. lVhen the position of the clamping jaw D is, however, as previously described, altered, it will be seen that such parallelism is destroyed inasmuch as the seat (1 is raised or loweredand contact between jaw f and the upper surface of the bolt-head is effected at a difierent point in the path of movement of such jaw. Means are therefore provided for imparting to this end f the re quired parallelism. To effect this purpose, the pivotal pin f of the arm F is made so that it may have imparted to it various positions vertically, and to this end it is mounted in a slot 5 Fig. 5, and has project ing from its upper surface a screw 12* fixedly secured thereto and projecting through a portion 6 of the frame. A thumb-nut b engages the screw above the frame, and by turning such nut it will be seen that the pivotal pin may be raised or lowered, to raise.

or lower pivoted end of the arm F. This movement, it will be seen, changes the position of the end f of the jaw f, and the lat-- ter may therefore be given the required parallel position.

The front end of the arm F is held normally in an elevated position by means of a spring G, the lower end of which is secured to such arm and the upper end of which is secured to a suitable fixed standard g. Engaging the upper surface of this arm F is a cam H formed upon the lower end of a manually operable'clamping lever H. This lever is pivoted upon a pin 71. When the upper end of the lever 11 is thrown back, it rests against a supporting spring J When such upper end is pulled forward, the cam H engages the upper surface of the arm F so as to effect the downward movement of the clamping jaw f to engage the 'upper surface of a bolt-head while seated in the stationary jaw D Inasmuch as the position, as previously described, of the pivotal axis of the arm F is changed to meet various requirements, it is necessary to provide means for changing the pivotal axis of the lever F, in order to maintain thepropcr relation between said arm and lever H. Toihis end, the pin it is formed on a block K. Fig. 6, which slides in, vertical guides 6 Fig. 3. Into this cross head is threaded a thumb-screw b, which is rotatably mounted in the adjoining portion of the frame of the welding-head. as shown in said Fig. 3. By turning this thumbscrew 6 1t Wlll be seen that the block may be raised or loiuered and the pivotal axis of the lever F, thereby changed to meet the re- 7. quireme'nts. A locking-screw I) is also pro:

vided, for locking this block in position, as will be readily understood from an. inspection of said Fig. 3. It-will therefore be seen that the two welding-heads are mounted upon the frame so as to be movable relatively toward and from each other, and each head comprises in its structure a pairof clamping jaws, one of which jaws in each such pair is stationary, and the other movable, together with means for adjusting the position of each of the stationary jaws in directions. which are transverse with relation to each other, the stationary jaw C '1) in retaining its position under the pres sure applied thereto during the welding operation. This screw is threaded into an upright 32 forming an integral part of frame member '13, and is provided with locking nuts I) b for retaining it in position. The head C is provided with the adjustable stopmember C which is in alinement with the clamping jaws of this welding head. This stop-member permits the proper positioning of the bolt-shank in the stationary jaw, pre paratory to the welding operation.

The operation of the above-described machine, after the necessary adjustments have been made, as previously described, is as follows: The two welding-heads are normally separated from each other, as shown in Fig. 1. The bolt-head to-be welded on to a shank is then placed in the seat d of the stationary clamping jaw D whereupon the upper end of the lever H is pulled forward to throw the arm F downwardly and cause the movable clamping jaw fto engage the upper surface of the said bolt-head and clamp it securely in place. The movable clamping-block (l is normally moved a distance from the stationary block-C so that the two clamping jaws 0 and C are separated from each other, as shown in Fig. 8. A blank boltshanl( is now placed in the stationary clamping jaw C, and its lefthand end caused-to abut the end of the stop C The upper end of the arm C is then pulled forward and the shank thereby securely clamped between said jaws.

The manually operable mechanismfor moving the welding-head B is then used to move such welding-head toward the wel ling-head C and bring the previously described bolt-head and bolt-shank into the required contact, whereupon the current passes through these two elements, produces to said member, means -movable, and means means for adjusting the position of the other and from each other; one of said heads be- -assume positions sleeve mounted in said head so as to be capadescribed my invention,

what I claim and Patent is 1. In apparatus for welding by electricity, the combination with a suitable frame; of two weldingdieads mounted upon said frame and relatively movable toward and from each other, each comprising in its structure a pair of clamping jaws, one of said jaws in each pair being stationary and the other for adjusting the position of oneof said stationary jaws to assume positions in different horizontal planes; and

of the said stationary jaws to assume posltions in different vertical planes.

$3 In apparatus for welding by electricity, the combination with a suitable frame; 0 two welding-heads mounted upon said frame so as to be relatively movable toward ing provided with a pair of clamping-jaws, one of which is stationary and the other of which is movable, said stationary jaw being K mountedu'pon a horizontal slideway placed transversely of said frame, and means for adjustably securing said stationary jaw in place on said. slideway; the other of said heads being provided with a pair of clampingajaws, one of which is movable and the other of which is stationary, said stationary jaw being mounted soas to be movable to in different horizontal planes; and means for securing said lastnamed jaw in such position.

3. In apparatus for welding by electricity, the combinationwith a suitable frame; of a v welding-head mounted upon said frame and comprising in its structure a pair of clamping-jaws, one of which is stationary and the other of which is movable, a cylindrical ble of being adjusted in various positions about its axis, a cylindrical member eccentricallymounted in said sleeve, said stationary jaw being secured to such member, and means for fixing said sleeve in position and for securing said cylindrical member within said sleeve.

4. In apparatus for welding by electricity, the combination with-a suitable frame; of a welding-head mounted upon said frame and comprising in its structure a sleeve having an outer cylindrical bearing surface mounted in a bearing formed upon said head, a cylindrical member eccentrically mounted in said sleeve, a clamping jaw fixedly secured for fixedly securing said. sleeve'in its bearing and fixedly securnoaaeaa ing said member within said sleeve, and a movable clamping-jaw cooperating with said first-named clampingjaw.

5. In apparatus mounted upon said frame and comprising in its structure a stationary clamping-j aw, means for adjusting said jaw to assume various positions above said a welding-head frame, a pivotally mounted arm carrying a second aw movable toward and from said stationary jaw, and means whereby the pivotal axis of said arm may be adjusted to assume various positions above said frame.

6, In apparatus for welding by electricity, a welding-head comprising the combination of a main or body member provided with a cylindrical bearing-surface; a cylindrical split sleeve mounted in said bearing-surface and provid d with an interior cylindrical bearing-surface eccentrically located with reference to the exterior surface; a cylindrical member mounted within said eccen- .tric bearing surface; ,a clamping-j aw fixedly secured to said member; a clamp for securing said sleeve in its bearing and adapted to secure said cylindrical member in said sleeve; and a movable clamping-j aw adapted to cooperate with said first-named clamping-jaw. .i

1. In apparatus for welding by electriity,

, for welding by electricity I the combination with a suitable frame; of

' a welding-head comprising the combination of a stationary clamping-jaw; a pivotally mounted arm provided with a second clamping-jaw arranged to cooperate with said first-named jaw means whereby the pivotal axis of said arm may be varied; a manuallyoperable cam-lever pivotally mounted and adapted to actuate said movable arm; and means whereby the positions of the pivotal axis of said cam lever may be varied.

8, In apparatus for welding by electricity, the combination of a suitable frame a welding-head fixedly mounted longitudinally upon said frame; and a second welding head mounted so as to be reciprocable longitudinally upon said frame; said frame being provided with longitudinal slideways passing beneath said fixed welding-head, and said reciprocable welding-head being provided with a main frame member having slides mounted in said slideways, and extending beneath said fixed head.

Signed by me, this 21st day of April, 1910. 

